| 1 | /* Copyright (C) 2003-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <errno.h> |
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| 19 | #include <pthreadP.h> |
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| 20 | #include <string.h> |
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| 21 | #include <sysdep.h> |
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| 22 | #include <sys/types.h> |
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| 23 | #include <sys/param.h> |
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| 24 | #include <shlib-compat.h> |
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| 25 | |
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| 26 | |
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| 27 | int |
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| 28 | __pthread_attr_getaffinity_new (const pthread_attr_t *attr, size_t cpusetsize, |
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| 29 | cpu_set_t *cpuset) |
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| 30 | { |
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| 31 | const struct pthread_attr *iattr; |
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| 32 | |
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| 33 | iattr = (const struct pthread_attr *) attr; |
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| 34 | |
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| 35 | if (iattr->extension != NULL && iattr->extension->cpuset != NULL) |
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| 36 | { |
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| 37 | /* Check whether there are any bits set beyond the limits |
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| 38 | the user requested. */ |
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| 39 | for (size_t cnt = cpusetsize; cnt < iattr->extension->cpusetsize; ++cnt) |
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| 40 | if (((char *) iattr->extension->cpuset)[cnt] != 0) |
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| 41 | return EINVAL; |
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| 42 | |
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| 43 | /* Copy over the cpuset from the thread attribute object. Limit the copy |
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| 44 | to the minimum of the source and destination sizes to prevent a buffer |
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| 45 | overrun. If the destination is larger, fill the remaining space with |
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| 46 | zeroes. */ |
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| 47 | void *p = mempcpy (cpuset, iattr->extension->cpuset, |
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| 48 | MIN (iattr->extension->cpusetsize, cpusetsize)); |
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| 49 | if (cpusetsize > iattr->extension->cpusetsize) |
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| 50 | memset (p, '\0', cpusetsize - iattr->extension->cpusetsize); |
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| 51 | } |
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| 52 | else |
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| 53 | /* We have no information. */ |
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| 54 | memset (cpuset, -1, cpusetsize); |
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| 55 | |
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| 56 | return 0; |
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| 57 | } |
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| 58 | versioned_symbol (libpthread, __pthread_attr_getaffinity_new, |
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| 59 | pthread_attr_getaffinity_np, GLIBC_2_34); |
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| 60 | #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_4, GLIBC_2_34) |
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| 61 | compat_symbol (libpthread, __pthread_attr_getaffinity_new, |
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| 62 | pthread_attr_getaffinity_np, GLIBC_2_3_4); |
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| 63 | #endif |
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| 64 | |
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| 65 | |
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| 66 | #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_3_4) |
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| 67 | int |
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| 68 | __pthread_attr_getaffinity_old (const pthread_attr_t *attr, cpu_set_t *cpuset) |
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| 69 | { |
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| 70 | /* The old interface by default assumed a 1024 processor bitmap. */ |
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| 71 | return __pthread_attr_getaffinity_new (attr, 128, cpuset); |
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| 72 | } |
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| 73 | compat_symbol (libpthread, __pthread_attr_getaffinity_old, |
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| 74 | pthread_attr_getaffinity_np, GLIBC_2_3_3); |
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| 75 | #endif |
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| 76 | |
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